Ultrafast carrier dynamics in purified and as-grown single-walled carbon nanotube films
Long Yong-Bing (龙拥兵)ab, Song Li (宋礼)c, Zhang Chun-Yu (张春雨)b, Wang Li (汪力)b, Fu Pan-Ming (傅盘铭)b, Zhang Zhi-Guo (张治国)b, Xie Si-Shen (解思深)c, Wang Guo-Ping (汪国平)a #br#
a Department of Physics, Wuhan University, Wuhan 430072, China; b Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; c Center for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China
Abstract Ultrafast time-resolved optical transmissions in purified and as-grown single-walled carbon nanotube films are measured at a temperature of 200K.The signal of the purified sample shows a crossover from photobleaching to photoabsorption. The former and the latter are interpreted as the state filling and the red shift of the $\pi$-plasmon, respectively. The signal of the as-grown sample can be perfectly fitted by a single-exponential with a time constant of 232fs. The disappearance of the negative component in the as-grown sample is attributed to the charge transfer between the semiconducting nanotubes and the impurities.
Received: 03 February 2005
Revised: 16 June 2005
Accepted manuscript online:
(Defects and impurities: doping, implantation, distribution, concentration, etc.)
Fund: Project supported by the Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences.
Cite this article:
Long Yong-Bing (龙拥兵), Song Li (宋礼), Zhang Chun-Yu (张春雨), Wang Li (汪力), Fu Pan-Ming (傅盘铭), Zhang Zhi-Guo (张治国), Xie Si-Shen (解思深), Wang Guo-Ping (汪国平), Ultrafast carrier dynamics in purified and as-grown single-walled carbon nanotube films 2005 Chinese Physics 14 2137
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